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1 | /* thread_info.h: MIPS low-level thread information | |
2 | * | |
3 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
4 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
5 | */ | |
6 | ||
7 | #ifndef _ASM_THREAD_INFO_H | |
8 | #define _ASM_THREAD_INFO_H | |
9 | ||
10 | #ifdef __KERNEL__ | |
11 | ||
12 | ||
13 | #ifndef __ASSEMBLY__ | |
14 | ||
15 | #include <asm/processor.h> | |
16 | ||
17 | /* | |
18 | * low level task data that entry.S needs immediate access to | |
19 | * - this struct should fit entirely inside of one cache line | |
20 | * - this struct shares the supervisor stack pages | |
21 | * - if the contents of this structure are changed, the assembly constants | |
22 | * must also be changed | |
23 | */ | |
24 | struct thread_info { | |
25 | struct task_struct *task; /* main task structure */ | |
26 | unsigned long flags; /* low level flags */ | |
27 | unsigned long tp_value; /* thread pointer */ | |
28 | __u32 cpu; /* current CPU */ | |
29 | int preempt_count; /* 0 => preemptable, <0 => BUG */ | |
30 | mm_segment_t addr_limit; /* | |
31 | * thread address space limit: | |
32 | * 0x7fffffff for user-thead | |
33 | * 0xffffffff for kernel-thread | |
34 | */ | |
35 | struct pt_regs *regs; | |
36 | long syscall; /* syscall number */ | |
37 | }; | |
38 | ||
39 | /* | |
40 | * macros/functions for gaining access to the thread information structure | |
41 | */ | |
42 | #define INIT_THREAD_INFO(tsk) \ | |
43 | { \ | |
44 | .task = &tsk, \ | |
45 | .flags = _TIF_FIXADE, \ | |
46 | .cpu = 0, \ | |
47 | .preempt_count = INIT_PREEMPT_COUNT, \ | |
48 | .addr_limit = KERNEL_DS, \ | |
49 | } | |
50 | ||
51 | #define init_thread_info (init_thread_union.thread_info) | |
52 | #define init_stack (init_thread_union.stack) | |
53 | ||
54 | /* How to get the thread information struct from C. */ | |
55 | register struct thread_info *__current_thread_info __asm__("$28"); | |
56 | ||
57 | static inline struct thread_info *current_thread_info(void) | |
58 | { | |
59 | return __current_thread_info; | |
60 | } | |
61 | ||
62 | #endif /* !__ASSEMBLY__ */ | |
63 | ||
64 | /* thread information allocation */ | |
65 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) | |
66 | #define THREAD_SIZE_ORDER (1) | |
67 | #endif | |
68 | #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) | |
69 | #define THREAD_SIZE_ORDER (2) | |
70 | #endif | |
71 | #ifdef CONFIG_PAGE_SIZE_8KB | |
72 | #define THREAD_SIZE_ORDER (1) | |
73 | #endif | |
74 | #ifdef CONFIG_PAGE_SIZE_16KB | |
75 | #define THREAD_SIZE_ORDER (0) | |
76 | #endif | |
77 | #ifdef CONFIG_PAGE_SIZE_32KB | |
78 | #define THREAD_SIZE_ORDER (0) | |
79 | #endif | |
80 | #ifdef CONFIG_PAGE_SIZE_64KB | |
81 | #define THREAD_SIZE_ORDER (0) | |
82 | #endif | |
83 | ||
84 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) | |
85 | #define THREAD_MASK (THREAD_SIZE - 1UL) | |
86 | ||
87 | #define STACK_WARN (THREAD_SIZE / 8) | |
88 | ||
89 | /* | |
90 | * thread information flags | |
91 | * - these are process state flags that various assembly files may need to | |
92 | * access | |
93 | * - pending work-to-be-done flags are in LSW | |
94 | * - other flags in MSW | |
95 | */ | |
96 | #define TIF_SIGPENDING 1 /* signal pending */ | |
97 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
98 | #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ | |
99 | #define TIF_SECCOMP 4 /* secure computing */ | |
100 | #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ | |
101 | #define TIF_UPROBE 6 /* breakpointed or singlestepping */ | |
102 | #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ | |
103 | #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ | |
104 | #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ | |
105 | #define TIF_NOHZ 19 /* in adaptive nohz mode */ | |
106 | #define TIF_FIXADE 20 /* Fix address errors in software */ | |
107 | #define TIF_LOGADE 21 /* Log address errors to syslog */ | |
108 | #define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ | |
109 | #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ | |
110 | #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ | |
111 | #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ | |
112 | #define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ | |
113 | #define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ | |
114 | #define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ | |
115 | #define TIF_USEDMSA 29 /* MSA has been used this quantum */ | |
116 | #define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ | |
117 | #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ | |
118 | ||
119 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
120 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
121 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
122 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) | |
123 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) | |
124 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
125 | #define _TIF_UPROBE (1<<TIF_UPROBE) | |
126 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) | |
127 | #define _TIF_NOHZ (1<<TIF_NOHZ) | |
128 | #define _TIF_FIXADE (1<<TIF_FIXADE) | |
129 | #define _TIF_LOGADE (1<<TIF_LOGADE) | |
130 | #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) | |
131 | #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) | |
132 | #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) | |
133 | #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) | |
134 | #define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) | |
135 | #define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) | |
136 | #define _TIF_USEDMSA (1<<TIF_USEDMSA) | |
137 | #define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) | |
138 | #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) | |
139 | ||
140 | #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ | |
141 | _TIF_SYSCALL_AUDIT | \ | |
142 | _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) | |
143 | ||
144 | /* work to do in syscall_trace_leave() */ | |
145 | #define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ | |
146 | _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) | |
147 | ||
148 | /* work to do on interrupt/exception return */ | |
149 | #define _TIF_WORK_MASK \ | |
150 | (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ | |
151 | _TIF_UPROBE) | |
152 | /* work to do on any return to u-space */ | |
153 | #define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ | |
154 | _TIF_WORK_SYSCALL_EXIT | \ | |
155 | _TIF_SYSCALL_TRACEPOINT) | |
156 | ||
157 | /* | |
158 | * We stash processor id into a COP0 register to retrieve it fast | |
159 | * at kernel exception entry. | |
160 | */ | |
161 | #if defined(CONFIG_MIPS_PGD_C0_CONTEXT) | |
162 | #define SMP_CPUID_REG 20, 0 /* XCONTEXT */ | |
163 | #define ASM_SMP_CPUID_REG $20 | |
164 | #define SMP_CPUID_PTRSHIFT 48 | |
165 | #else | |
166 | #define SMP_CPUID_REG 4, 0 /* CONTEXT */ | |
167 | #define ASM_SMP_CPUID_REG $4 | |
168 | #define SMP_CPUID_PTRSHIFT 23 | |
169 | #endif | |
170 | ||
171 | #ifdef CONFIG_64BIT | |
172 | #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) | |
173 | #else | |
174 | #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) | |
175 | #endif | |
176 | ||
177 | #define ASM_CPUID_MFC0 MFC0 | |
178 | #define UASM_i_CPUID_MFC0 UASM_i_MFC0 | |
179 | ||
180 | #endif /* __KERNEL__ */ | |
181 | #endif /* _ASM_THREAD_INFO_H */ |